Nothing illustrates the steady corrosive powers of water like a river canyon. Carving their way through solid rock, sometimes over the course of millions of years, rivers slowly create these incredible and vast natural sculptures.
Long and deep canyons are particular places of wonder. Some, like Arizona's Grand Canyon, are well known; others, such as Tibet's Yarlung Tsangpo Grand Canyon, aren't quite so famous. However, they're all astonishing in their own unique ways.
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